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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b5ce7427eaedc5f196778514214fcff78f91a67c31535f4fdac1ad06a4ad50' 
  AND token = 'DioXQezPjgn9eMA9RUNlHqj+WC0hm1Ru3J0xHGnrDu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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