Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a86ab900d2b2cef70b83543308c65f9d2f72eac5539af7f29aa8c151c0865b6' 
  AND token = '0s9uuyq/Nl00bpuFR3NxgnntXMU5rTX2wdPZPKR675M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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