SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'bc9f057d67f747ea20a10ae9c5ad0783a326bb30f2df75c7ca0c0b492d5b8870' 
  AND token = 'q8X0hPpAxZlvSjlhGMJhs0TZDfIi8GYAmCIG//Lzn8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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