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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e3860f6d576684dc742b3c23720e5bcecd506066b2ae8ad0f245b0591ff9a7' 
  AND token = 'JHOnk9v9SVMUsvDU9pZTr2ehwrpjYiJPAnxQ08UkwCA=' 
  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"
    }
  }
}