Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7f4210824c45b6549369e3448816e3edd62f2339957921a8df753bf6d1812cdd' 
  AND token = 'rFb/rEyk4Nfamern7Reg4971QPqg0oos0kmeCRrAP20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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