Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e78093ac6966b243ce1d26e5d6925c3b92bce80c8d547a41019e7ea71a7d7b1' 
  AND token = '+uWbVqlnb3MQQNbNpIZuKdWSo6SOT4ydiP1MrDMrQlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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