Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '97ef98c30be6188e6e58855bc2a5fe481f721236a8ce9f3c72f2be0263a8b753' 
  AND token = 'C6iy0tFmaxTv5UDAJW6IuDqyFRTlIW/dMyaqCHNGP8w=' 
  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"
    }
  }
}