SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4617ea95cfb0d2acd85d871753b1f04ae4ed2828d34233499f40cfb261f1bc' 
  AND token = 'onY3maruPBQ3RehCu1K7gOvFo3TBQYKG1lgVHznSXHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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