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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57e4d02044a8b223cf0eefd2b870c3e7a776b7ea057d87d1243a74eb03e29fc' 
  AND token = 'YQCStPavD4poCyj2L0BK03unCCQAbJLo9fdpZo3Y1b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}