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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900dd6bf2721a7e8bcfa254dde61fddca5baf114fe0da190d6581b081ae91c45' 
  AND token = '+NePHoxCrvLXKpWi468eYs44Rj6G8SO5CbMFGqjUKcM=' 
  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"
    }
  }
}