Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd9959d04249e9f19ca26ffe3ddedfa528007d977fa85bff2012058255ae1da00' 
  AND token = 'omBssSVTYGM8j5oJooNSAmpnBNaoGcqFY04YvtFneFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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