Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9c0a140e2a0811a7f7157409e5b332e65187629fef052d1b33aa79f5acc539' 
  AND token = 'd4NqMdBR3CQebGLT3InsPH0LtyMESVZvHT7tww5r/Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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