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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bf2c6d3f0cc409e307c1a72c5aaf7cc327896b9dd09d7d7f8b033cbca902da' 
  AND token = '1YxRTBIZCPT6UmkArq9yEG+Dko2NnS2n8oOp0beLaVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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