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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fcc712af148871fb1b69f69541672fed0a254217e6d98abbfb03750cb7d075' 
  AND token = 'IeqBh9MZQzHfBvPgt20bJdlU3YRNRO3DIz24HQdkX3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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