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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccaeedb8cd29c979614f6c4ae16d4087ed414145b796912a66a32eb61cf2fc7' 
  AND token = '6zY0uLe6oTos+c5oAj48oXCd6ceG8hbuBaZNQGoCHZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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