Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6064aad5861adf9cc4961a55f090647a6d12a946a096e96a9ae0f1d2c3d5dd' 
  AND token = 'OzHe+5I/cq8uPSRcYEn8v2EMI5fbzfvvDyt+a72m+9A=' 
  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"
    }
  }
}