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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5981d9bcb477c695bb4784e5a1f7033b7b71936ebdd3e2d1b01ea07bcba6fe63' 
  AND token = '7xQEe+r9hlp9dxrbkzYi10L1PEDmQkO9bShX5acEB8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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