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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323eb58dde6959c96ac54aa1007925c1ed5129ba01b83db181e0c90ab4a1868a' 
  AND token = '8zRzzLGrBYk7TAGciHjVnn2S/kYRwH4mZYtarnS9VBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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