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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b11d6b2fb5311d2bde185cdbfc563363c631886c1049bce8e9abea1619c5585' 
  AND token = '9Q+uhOLiZxA26N4h9ygtaP2uO4z0aik4uDrxMOucZCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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