SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af402087d7179418ea846235f02a9961f69f80aeb06268f2391bdadc44135586' 
  AND token = 'B7wKnZ7ZzifzfEpLZgjGk396gVDq7JEjyNADQzJ5gac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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