Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba26c15a44119375ef034f430de48301cb17f6940e28879ded0aacb7447402e2' 
  AND token = '02im30enAsiPzt2iDJqWj0Jlo+KO2pv0IbLTxckF/Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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