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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f2fb09ce7dde671f12e8f308f86d6b944cef2251ca283fe0a5a98b308f5c77' 
  AND token = 'PX5HU+ICGEmOJVVrp799G8JSB0vlF4xRx+ikFs1Pk9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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