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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc7c6d99b37ec7c71d3d0dd5846e51bf921fd3333cfb1b29a93663a56736d83' 
  AND token = 'TF5zQvEHuUdWo6WFFbuoX0bXUCwg/Y8hxi72ODepCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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