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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274d29bc8a01c79b3b7629ecb5dff4903b30f3d7983f1a03acd5b390c3cc12cc' 
  AND token = 'yN9lqZztAFKj7K3rJff2BOJ/fPxpUKjzsZ8VMWEIs1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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