Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f3eb3d4533ec096fa9a3e00807a84fb6241734b0e82306f9e695b3b558970ddc' 
  AND token = '4OHa3vhFe8Mf2WKfUCExpOxruJMmHKg66UeOkixDctQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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