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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1055c4b800647bfb989cdbf77255c367b4620ddb2d4e799515fbb24e99c607de' 
  AND token = 'A56/DwGpWDrtMwKDrBkF0NBDnRjLXVSpZXwxknwFoY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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