Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df5e6e9d07830a2c837eff6f525b8ddbcc99cbc951094e8238fc84e0383f56f' 
  AND token = '3E3Az1KRaperjzUP0DMRiKL6H2ra3wOnXi/Dh1W6nWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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