Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb93a04706ed75138448c6309a2845963668dcc6e2ff6c8a2c4c505bebfbdc2' 
  AND token = 'yBPQhrfPcB1IkbjCQfYMWJt+cUAq/eNWI2tcAk+hj0M=' 
  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"
    }
  }
}