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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab427e89a2117950c835ea9ea6a7cdb41106177008d798dc5d63047516f00c21' 
  AND token = '3BeKO5SJFUJSyuEr3hi114P6+HcjA7V9VG28XdYXhls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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