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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea78afd19004791044ac61da3a89d7455aafdf51d79c7c7d5c49d9e12104a7f' 
  AND token = '7aj9D7mJw7Uor9wM0OfyWGAY1jm0Jhdjf/eXfYn4r5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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