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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4ed91cded89c4fc041a8f02dc38c1af376d7c83915570eb8e5b14200557dbc' 
  AND token = 'Li7UXJ2Utc3JZ4L2QZmN7S5beaoL3oNKp9r9Gms+E+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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