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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696f23b5b271aae7ddd381af42add88368d4a6b9bedaf9c241a434f7dd77c527' 
  AND token = 'yAMKe0BG9mSqEeYvM73uRLVa4oTCRQb9iXAQfCo26+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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