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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22616160ad1bd5108bb114020d46c1439a50d933a1e40ec862cef47eebe2c7e8' 
  AND token = '/SZM1ilVX/AwJ8jJD+oS0aJOhlilXJSg85Ji4U9Hxpw=' 
  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"
    }
  }
}