Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae61e15b10916f6f8ef81ce2dea60f4b18dd3a0436a4c939fadf6b7dce7bfea6' 
  AND token = 'TnmVCvR/EHE5wmZqkKEQj219kcUg1gMpHs2qb+salLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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