SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62819dca23b48e5033357739faac5a7e86131822d6bbded9a251874c00aa886c' 
  AND token = 'wUDMKgHV4uHA/UF+Y6nEp18okIDq8qGxheCUoMQvWVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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