Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459a859ed69367aec0e5f0f1702cbf57c173d4a9d3a852bf3ccb8df4d55580aa' 
  AND token = 'PUmvEiIlFddCWWYGjoGP63w756Ellfp77UNVBtM5/To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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