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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6250027cec96247c9e527223e1b8bb435b6c50923897590f395983e1bd30bc78' 
  AND token = '2VoAsbmgFCO51Jrz0TkyZpemo3tDTnhG6F5nKv6oUP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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