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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcd9fcb7b4d6440d8ba742950ba706efa1cf66747cc1fb1be2efbea58d0a59c' 
  AND token = 'kJ4KXsGRUY8B5MqunfpQnPjooicNeYM9oL1Iibr4c4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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