SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93db6c0b5ad2940ea9e15cb5d8c49b0f9c32d94a52d6ad9d03656a18826a3b8' 
  AND token = 'wKo4e8oGJIrVz8J9EgYSozgXhnQ2ykVRt/IZUnCYvjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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