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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165388ed95da699da5ef82625fb9a8bc54a481be08b4c0d9c8e2703ae0692226' 
  AND token = 'UulgsFaasvh/H4Dbk5amA6wDFjXkXWMaheZZUAdKj8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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