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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e806ccc353ed823d37b2e34d96dbb228dd53ce44f36f05dc6aa946add1a4538' 
  AND token = 'UHzhOuO05IJVj1YhHdnR2kgKHDCkiID6cJM99kkIHwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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