Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '770a7043856557a78452bf8cfdd738e15cde8eec305095dc21f7ad43f97dfabd' 
  AND token = '5eV5LhkvuB20U7bOYQ4exsYxhOL401nFlJ0b98cEl3M=' 
  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"
    }
  }
}