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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dade60c9c0917a798c411c0a5cc7604d292bbc743dd638cb82d7b9cc49ec2876' 
  AND token = 'q84CH6kuDytUQs5VG8KzRjy3rp46DScTFEKp3R3dRtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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