Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7aa4a13ace052a82c29d406414e12cf2b2271f6a53e2ca3b0f65c2bf895ecf' 
  AND token = '7AfehryLuHCO4+GgtXzteYIk6thROqd4DjkWGtA6/mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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