Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0393980ece9bd44d83e6dd2d20602fec2f4bcedb045e3a490e6ccf828f5c516a' 
  AND token = 'Qn9fl6gZsrAceV8+ez+F0x7ufV/CsSCTgnuE9096cG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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