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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e1b7b6373467c6575ec53302d008c3ebff826ab8b16155196d6ea744eab0a4' 
  AND token = 'rwXugQckSvUfnu1S+xM1/iQhFP8b9OD6HgptYZ/pZPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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