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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5868509e1c0a9d6682a8b5b110739767578c1fbafd05f521dd6bacacc73306' 
  AND token = 'FKWQvh+uJ0U/vg5R26gzqqe02o13ujI78ySp2R5rJ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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