Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e029f66ebf3c30ecea55caecbb370946a9e622ead55410747220d126de788241' 
  AND token = 'Q6ht0rDsVCvpWLNLn5tlOnrVV+DiPwD4a1VTi4KIapM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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