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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de0c33e2578d414bf09e0d402d0c1f6202c8dc45dbbcc3996bfd6af8bd17b31' 
  AND token = 'vzJ+D31o574zEOgk+b+79kL0C83AdrTwbPy/VNYIenw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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