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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac68728ea784eb8f2ed4185588a5ab01441299d523dc29689c3fc0d56ad8edad' 
  AND token = 'P8yrvhHAbkvBZiG3yBuzzjKAbu1JpG2lx5ZTfWeGc+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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