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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0c379f588e0ea4fbba210c8ddb4e3e09133054b3f25366293da8148605b456' 
  AND token = 'ClxyPQWUGYaDl4HrbbPrzcelYdIRKjm7I3AfGyR3YlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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