Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71702a229d7e804ea21928eaceb16c6342bed97adf4a0a69b3a4a5af29bd9897' 
  AND token = '+eZv+2r8o2N/sBa7nvjxRD3QEjaHiscgaGtPz3jbdZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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