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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679f1c067c79d8f896632384831d8b7630dfa7f1d940e8c728c145ed62ed0c07' 
  AND token = 'Q0hLbED+WYikvXT+uIKjREDFpaUYoZu89BprjkwxEn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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