Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '304a0f9e758ffa3e0d5a4dffa6c79f28feb1f3ae58c654d7be4ee02921da21ce' 
  AND token = 'QvH1KR0/ZF/ofLUbKfuutKCa++3C+OL4dc8WehFRF00=' 
  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"
    }
  }
}