Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdfd8aa8479a17f80237870698e8c95f1cc6efab50ef8cebd37f621151c7bae' 
  AND token = 'gt5kvvYfOfpA9AtY+yBa1TWk+Db1KZOpKvzEVuxzJ/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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