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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b0d4a723ba3b6993096e33b7652d6d31cfd6b8d237757ec5106900f3978eda' 
  AND token = 'uKRk1tbV890xQqmaBbGGiX81XKvBqM/qDIyO/5pKmz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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