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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fd26daac0a843c1048d81e3865a5ad8b9c33b4b97ced5cc02934f829eff66e' 
  AND token = '7+tNf4OGFERyhyoPr9t98ulwQPmmge5ZXTyiV2buai0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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