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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3d42fa3ef62400e05c9d56d6f44eae1e049a8d172f6281bd633a234ef6e9fb' 
  AND token = 'xBQvo2I41OALyJOXkQskLMzzI8tZHgyl1tQbxPCceMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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