Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd99d68813b752612fb73151b124d9a940794e1a127d411e413a78957b4ac5c' 
  AND token = '9JwefO0xESKYfzPGWobcvGfptbEh1rTjJbVMKc8UpU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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