SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9b16b38e25835f3c6b9756719db4a28cf416efa5d962df9c4907bfe08e392f' 
  AND token = 'BKVZ2mn10KdN/wTRf0Kc9D3LvrFpAJCauDsH14h+qsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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