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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec021f488e08b363659f8bd99993bb75d5418cccb5eb50f53bba5bab27555193' 
  AND token = 'sx6gPoXPoJ39v97A8gLSJ3w5lGKieeW1DtlGNmNhb4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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